Two issues caused the agent to get stuck after the last log message
from a completed scanner (e.g. "✓ reddit_trending: 11 candidates"):
1. `as_completed()` had no global timeout. If a scanner thread blocked
in a non-interruptible I/O call, `as_completed()` waited forever
because it only yields a future once it has finished — the per-future
`future.result(timeout=N)` call was never even reached.
Fixed by passing `timeout=global_timeout` to `as_completed()` so
the outer iterator raises TimeoutError after a capped wall-clock
budget, then logs which scanners didn't complete and continues.
2. `SectorRotationScanner` called `get_ticker_info()` (one HTTP request
per ticker) in a serial loop for up to 100 tickers from a 592-ticker
file, easily exceeding the 30 s per-scanner budget.
Fixed by batch-downloading close prices for all tickers in a single
`download_history()` call, computing 5-day returns locally, and only
calling `get_ticker_info()` for the small subset of laggard tickers
(<2% 5d move) that actually need a sector label.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
ce2a6ef8fa